[no-unsafe-readonly-mutable-assignment]: problem with [Symbol.iterator]

[Perfectoff]

It seems that this rule does not work correctly with [Symbol.iterator]. I'm trying to cast a readonly array to a readonly Iterable, but I get an error: "Using a readonly type to initialize a mutable type can lead to unexpected mutation in the readonly value."

const arr : readonly number[] = [];

const it1 : Iterable<number> = arr; // error!

const it2 : Readonly<Iterable<number>> = arr; // error!

So what should I do about it?

[Perfectoff]

Well, the problem is even worse. We can't even do this:

const arr : readonly number[] = [];
const obj : {} = arr; // error!

[danielnixon]

Fixed in v6.6.1